Steelers star safety Troy Polamalu will have his injured left knee re-examined Wednesday before practice, according to a source with knowledge of the situation, to determine if he can return for this weekend’s crucial game against the Ravens.

The Chargers and Titans hit the practice field on Tuesday — normally a day off for teams — in advance of their Christmas Day NFL-Network matchup in Tennessee, and it looks like San Diego could be optimistic about receiving a boost on its offensive line.